Gunners Heart, a SkyGunner inspired game works great with resolution forcing (minor text artifacts). By default it's a 640x480 only game.
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Myth: The Fallen Lords' 3DFX render works, some artifacts with resolution forcing. No widescreen, which is only available in the unofficial OpenGL renderer.
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Myth II: Soulblighter's Direct3D render also works great (on the latest unofficial patch, haven't tested unpatched), maybe a bit weird to use considering the game has updated Direct3D11 and OpenGL renders available, but neither of those has any sort of UI scaling.
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Recoil works with resolution forcing (usually limited to 1024x768) with both 3DFX and Direct3D renders. Screenshot is Direct3D.
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I said earlier Metal Fatigue still didn't work. That wasn't true, it has worked since 2.51. I just didn't retest with the ATI Radeon virtual GPU. It works with resolution forcing, but has some glitches in borders. It can probably be fixed by a post-processing shading (some Reshade shader that colors everything black + UI mask). Also the game seems to handle widescreen nicely despite not offering it in its options (I had to change 1600x1200 to 1280x720 in DirectXRendEng.dll). FMVs and menus are stretched, but gameplay is perfect.
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